将值推送到作为对象值的数组

Question

我有以下结构：

let mappings = {
    "1002": ["1000", "1003"],
    "2000": ["2001", "2002"]
}

我要添加这条数据

const issueTypes = ["4000"]

每个以这个结尾的对象键数组

mappings = {
    "1002": ["1000", "1003", "4000"],
    "2000": ["2001", "2002", "4000"]
}

这是我目前拥有的：

mappings = Object.keys(mappings).reduce((prev, curr, index) => {
            console.log("prevous", prev)
            console.log("curret", curr)
        return ({
            ...prev, [curr]: //unsure of this part which is kind of crucial
        })}, mappings)

任何帮助将不胜感激

Answer 1

为什么不直接遍历对象的值，然后推送？

const mappings = {
    "1002": ["1000", "1003"],
    "2000": ["2001", "2002"]
}
const issueTypes = ["4000"]
for (const arr of Object.values(mappings)) {
  arr.push(...issueTypes);
}
console.log(mappings);

如果必须不可变地完成，将对象的条目映射到一个新的条目数组，同时将新的 issueTypes 传播到值中。

const mappings = {
    "1002": ["1000", "1003"],
    "2000": ["2001", "2002"]
}
const issueTypes = ["4000"]
const newMappings = Object.fromEntries(
  Object.entries(mappings).map(
    ([key, arr]) => [key, [...arr, ...issueTypes]]
  )
);
console.log(newMappings);

Answer 2

手续很简单。你需要做的是这个—

遍历 mappings 对象的每个值。
推送新值

参考以下代码适配—

let mappings = {
    "1002": ["1000", "1003"],
    "2000": ["2001", "2002"]
}

const issueTypes = ["4000"]


for (const item in mappings) {
    mappings[item].push(issueTypes[0])
}

希望对您有所帮助！ :)

将值推送到作为对象值的数组

Pushing value to array that is the value of an object

javascript

arrays

object